Enzyme-Based Technologies: Perspectives and ... - ACS Publications

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Enzyme-Based Technologies: Perspectives and Opportunities Alan S. Campbell,1 Chenbo Dong,1 Nianqiang Wu,2 Jonathan S. Dordick,*,3 and Cerasela Zoica Dinu*,1 1Department

of Chemical Engineering, West Virginia University, Morgantown, West Virginia 26506 2Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, West Virginia 26506 3Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 *E-mail: [email protected] (J.S.D.); [email protected] (C.Z.)

Enzymes are biological catalysts that are currently used for biocatalysis, biofuel synthesis and biological fuel cell production, for biosensors, as well as as active constituents of surfaces with antifouling and decontamination properties. This review is focused on recent literature covering enzyme-based technologies with emphasis on enzymes as preferred catalysts that provide environmentally friendly, inexpensive and easy to use alternatives to existing decontamination technologies against a wide variety of pathogens, from bacteria to spores.

© 2013 American Chemical Society In Green Polymer Chemistry: Biocatalysis and Materials II; Cheng, H., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2013.


Introduction Enzymes are biological catalysts with high selectivity and specificity (1, 2) that are employed in a wide range of applications from industrial catalysis (3–6), to biofuel (7–10) and biofuel cell production (11–13), from biosensing (14–16), to pharmaceutical and agrochemical synthesis (17–19), and in surface active materials with antifouling (20–22) or decontamination (23, 24) capabilities. Their high specificity and selectivity have enabled enzyme-based industrial processes with high yields and fewer harmful byproducts than those resulting from traditional chemical processes (3, 4, 8). Furthermore, enzymes operate at much milder conditions of temperature, pressure and pH than conventional catalysts (1, 2), thereby providing substantial energy and manufacturing costs savings (3, 25). However, there are a number of practical problems associated with the development of enzyme-based technologies in vitro. For instance, enzyme isolation and purification is laborious and costly (18) and most of the isolated enzymes have optimum activity in water-based environments. Further, in such applications (26) their increased specificity and selectivity could lead to narrow-ranged and focused catalysis, thus enzyme-based systems with short operational lifetimes (1, 2). Enzyme immobilization is used as a viable alternative to overcome the limitations of enzyme-based applications in vitro and to ensure high enzyme activity retention and high operational stability (2, 27). The choice of immobilization technique is determined by considering both chemical and physical properties of the enzymes and of the support surfaces. As such, immobilization has been achieved by entrapping enzymes into polymer matrices (28, 29), Langmuir-Blodgett films (30, 31), solid- (32) or liquid- (33) based membranes, or simply by attachment of enzymes onto solid supports (either by covalent or physical immobilization) (16, 34, 35). This review is focused on the current trends in enzyme-based technologies and our own research aimed at developing decontamination platforms based on enzymes and capable of neutralizing bacteria, viruses and spores (23, 24, 36). Various enzyme immobilization strategies are discussed and further insights into the next generation of surface decontamination technologies are provided, outlining the studies that are underway to enable these technologies to be self-sustainable (i.e. operate under ambient conditions without external addition of the enzyme substrate).

Industrial Catalysis Biocatalysis (25) has gained widespread use across several industries including food processing, specialty and commodity chemicals, and in pharmaceuticals production (5, 17, 18). For example, in pharmaceutical and chemical industries, enzymes are used to circumvent the often complicated steps required by chemical synthesis and separation in order to generate compounds of high purity, typically chiral, while having a much lower environmental impact (3, 17, 18). A hypothetical process is shown in Figure 1a; the image shows a nanoparticle-enzyme-based packing technology developed for large-scale industrial reacting. 16 In Green Polymer Chemistry: Biocatalysis and Materials II; Cheng, H., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2013.


Figure 1. Schematic diagrams for the applications of enzymes as biological catalysts currently used for industrial-based membrane separation (a), biological fuel cell (b), as core components in biosensors (c), and as active constituents of surfaces with antifouling and decontamination properties (d). (see color insert)

The industrial use of enzymes has been influenced by the emerging technologies that allowed recombinant technology or genetic engineering (3, 17, 18) to be implemented for the generation of enzymes with improved catalytic properties and selectivity (25, 37), as well as by the development of immobilization and polymer-based crosslinking techniques that allow enhanced enzyme stability (1, 2, 23). Specifically, when an enzyme is immobilized onto the surface of a chosen support it can become partially denatured, i.e., the secondary and tertiary structural features of the enzyme can be altered, thus reducing its activity (38). Furthermore, enzyme-enzyme aggregation can occur at high surface loadings, which can further reduce enzyme activity (39). Immobilization and crosslinking of enzymes onto nanoscale supports, such as carbon nanotubes, are not only capable of increasing enzyme activity and stability in extreme conditions (1, 23), but could also allow for enzyme retention and thus reusability in several reaction processes. Activies of the enzymes immobilized at the nanoscale support have been found to be influenced by the properties of the support (i.e., surface curvature, surface chemistry, etc.) as well as by the immobilization method being 17 In Green Polymer Chemistry: Biocatalysis and Materials II; Cheng, H., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2013.


used (covalent versus physical) (39). For example, when Dinu et al. immobilized perhydrolase S54V (AcT) onto single-walled carbon nanotubes (SWNTs), the immobilization process yielded ~20% of the specific activity compared to the activity of free enzyme in solution. However, when the enzyme was crosslinked using aldehyde dextran prior to immobilization onto the SWNTs, ~40% specific activity was retained (23). These advantages of using enzyme immobilization or enzyme crosslinking might reduce the high cost associated with enzyme production and use (18, 27).

Enzymes for Energy: Biofuel Synthesis and Biological Fuel Cells Enzymes are at the forefront of several emerging energy technologies that will help to revolutionize energy production on both the macro- and micro-scales. Energy-based applications of enzymes include: biofuel synthesis, and enzyme biofuel cell production. With the costs of fossil fuels on the rise and a greater push for more environmentally friendly energy sources, biofuels represent a valuable alternative energy source, with enzymatic processing being a critical component of the process (8, 40). Generally, biofuels are produced via the biochemical conversion (e.g., hydrolysis, esterification or transesterification) of renewable biomass, either chemically or enzymatically (7, 10). Biofuels such as bioethanol and biodiesel are a classification of fuels derived from biomass conversion. In the United States, bioethanol manufactured from cornstarch was widely used in recent years (41). Biodiesel is produced from a variety of sources through the transesterification of alkyl esters from feedstock and not only is more environmentally-friendly but also can be used with a higher efficiency than traditional gasoline (41). The selectivity and biocompatibility of enzymes lead to a more efficient process with fewer unwanted byproducts than traditional chemical processing (8). The large loading requirements and inherent cost of enzymes have reduced the enthusiasm for industrial scale use of enzymes for biofuel production (8). However, the economic viability of enzymatic processes can be improved through enzyme immobilization onto solid supports to allow for large-scale production (27) and reusability (42). Biological fuel cells transform the chemical energy of organic compounds, such as glucose or ethanol, into electricity by using enzymes as the catalyst (11, 12, 43). Figure 1b shows a schematic diagram of an enzyme-based fuel cell. The biofuel reaction is catalyzed by two different enzymes; the oxidation of the enzyme at the anode interface transfers the electrons to the cathode and onto a second enzyme to lead to electric current production. Enzyme functionality and specificity allow the construction of the fuel cells without a membrane separating the anode and cathode (12, 43). Due to this feature, enzyme-based fuel cells can be easily miniaturized to allow incorporation into implantable biomedical devices such as artificial organs, micro-pumps, micro-valves, pacemakers and sensors (13, 43) further decreasing the risk of cytotoxicity associated with the implants (13). 18 In Green Polymer Chemistry: Biocatalysis and Materials II; Cheng, H., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2013.


Enzymes as Biosensors Enzyme-based biosensors can be used for recognition and quantification of various analytes from sugar (44–46) to hydrogen peroxide (47), and from superoxide anions (48), to proteins (49). Enzyme-based biosensors are formed by immobilizing enzymes onto a wide range of transducers, including electrodes (50); the immobilized enzymes create an “open-gate-based electron communication window” with the electrode surface (51, 52). The general physical and chemical properties of the materials used in the construction of biosensors, as well as the working conditions being employed, play a significant role in the performance and the detection capability of the biosensor (53). For developing the next generation of viable biosensors with increased flexibility, accuracy, specificity and optimal performance, the proper support materials and enzyme immobilization conditions need to be carefully considered. The examples included below provide a comprehensive guide into current enzyme-based biosensors used in several laboratory and industrial settings. Glucose detection is of great importance in various fields such as the food industry, quality monitoring processes, and in clinical settings for diabetes diagnosis and therapeutic maintenance (54). Due to their high surface area-volume ratio, as well as their low toxicity and ease of fabrication, metal oxide-based and carbon-based nanomaterials are considered excellent candidates for immobilization of glucose oxidase to lead to the next generation of glucose-based biosensors (Figure 1c) (55). Zinc oxide nanotubes were recently used in biosensor fabrication that allowed linear detection of glucose in only 3 s, with a limit of detection between 50 µM to 12 mM (56); in this example the reaction is catalyzed by the glucose oxidase enzyme which transfers electrons to the support conductive material. Similarly, glucose oxidase-tetragonal pyramid-shaped zinc oxide nanostructure biosensors allowed detection in a range of 50 µM to 8.2 mM (57). In other settings, glucose oxidase was immobilized onto platinum multi-walled carbon nanotube-alumina-coated silica nanocomposites to form biosensors that displayed wide linear detection up to 10.5 mM and response time of less than 5 s (58). Lastly, bionanocomposites comprising glucose oxidase-platinum-functional graphene-chitosan complexes were used to achieve a detection limit of 0.6 µM (59). For clinical application, a multi-layer cadmium telluride quantum dot-glucose oxidase conjugate biosensor was developed to detect glucose concentrations in serum; such a biosensor allowed glucose detection with minimal pretreatment of the sample and with increased accuracy (60). Lactose is a metabolic byproduct regulated by the food industry (61, 62). Novel, rapid, simple and inexpensive biosensors that allow precise detection of lactose were constructed by integrating 3-mercapto propionic acid functionalized gold electrodes and beta-galactosidase-glucose oxidase-peroxidase-mediator tetrathiafulvalene combined membranes (63). Such biosensors exhibited a linear detection range of 1.5 µM to 120 µM, with a detection limit of 0.46 µM. Furthermore, such biosensors had a working lifetime of nearly 1 month. Hydrogen peroxide is the byproduct of several biochemical oxidation processes, as well as an essential mediator in clinical, pharmaceutical, food 19 In Green Polymer Chemistry: Biocatalysis and Materials II; Cheng, H., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2013.


industry and environment (64). Fast, accurate and reliable detection of hydrogen peroxide was achieved using horseradish or soybean peroxidase enzyme-based systems. For instance, horseradish peroxidase was immobilized onto gold functionalized titanium dioxide nanotubes (65) or onto chitosan-based nanocomposites (66) to allow the construction of biosensors with a detection range from 5 µM to 400 µM (measurement limit of 2 µM) and hydrogen peroxide detection ranging from 0.6 µM and 160 µM (detection limit of 0.15 µM) respectively. Similarly, soybean peroxidase-based biosensors were formed by immobilization of the enzyme onto single-walled carbon nanohorns and showed linear detection ranging from 20 µM to 1.2 mM (detection limit of 0.5 µM) (67). Biological analytes ranging from superoxide anions to proteins have been detected using enzyme-based biosensors. The superoxide anion is mostly regarded as toxic leading to cellular death and mutagenesis (68). Recently, a novel disposable superoxide anion biosensor based on the enzyme superoxide dismutase was fabricated (48). Such a biosensor was able to detect superoxide anions in a range from 0.08 µM to 0.64 µM; furthermore, this biosensor showed increased sensitivity, accuracy and long term stability. Also, a horseradish peroxidase-gold nanoparticles-carbon nanotube hybrid biosensor proved to have excellent ability to detect human IgG protein for advancing immuno-analysis assays (69). Enzyme amperometric biosensors have also been developed and employed for the detection, monitoring and reporting of biochemical analytes related to a wide range of pathologies ranging from diabetes to trauma-associated hemorrhage (53). Implantable enzyme amperometric biosensors must recognize, transmute and generate physicochemical signals that are proportional to the chemical potential (concentration) of the analytes they are intended to be measured. Kotanen et al. have summarized the properties of such biosensors, as well as the conditions required to ensure enzyme biotransducer performance such as the stability, substrate interference, or mediator selection. The failures associated with enzyme-based biosensors are mainly due to the degradation of the immobilized enzyme or its denaturation at the interface by unfolding which could lead to loss of biorecognition and thus loss of signal transduction (51–53).

Enzyme-Based Bioactive Coatings Enzymes can be used to provide biological function to non-biological materials, thus leading to a “bioactive” material or surface (70). In many such applications, enzymes are incorporated into paint or polymer-based coatings and subsequently applied to a desired surface (22, 24, 71). Two of the main areas in which this type of technology is being employed are in the development of antifouling surfaces (20, 21) and surfaces with active decontamination capabilities (23, 36). Figure 1d illustrates the general principle of enzyme-based coatings; enzymes are immobilized onto nanosupports and upon entrapment in composite-based materials they can generate reactive species to prevent biofilm formation or to allow decontamination.

20 In Green Polymer Chemistry: Biocatalysis and Materials II; Cheng, H., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2013.


Enzyme-Based Antifouling Coatings The main aim of antifouling coatings is to prevent the attachment and growth of living organisms (referred to as a biofilm) onto a surface (22). This functionality is vital in many different applications including biomedical implants (72), biosensors (73) and several types of equipment used in industrial and marine settings (74, 75). There are two major steps in biofilm formation: the initial adhesion of the fouling species, and the proliferation of that species (22). To combat adhesion or reduce adhesion strength (76), “non-sticky” coatings have been developed (77). To deter proliferation, enzyme-based coatings that generate reactive species to prevent biofilm formation have been developed (22). Such technologies offer viable alternatives to traditional antifouling coatings that rely on the use of broadly cytotoxic compounds (78, 79), and further provide safer and more environmentally friendly substitutes.

Enzyme-Based Decontamination Coatings Enzyme-based decontamination platforms have been proposed as viable alternatives to currently available decontamination methods that use harsh chemicals and pose environmental and logistical burdens (80–82). Our groups have pioneered research into enzyme-nanomaterial-based coatings to be used as decontamination platforms that exhibit bactericidal, virucidal and sporicidal activities (23, 24, 36, 83). For instance, we have shown that upon enzyme immobilization onto carbon-based nanomaterials, including carbon nanotubes, enzyme S54V perhydrolase (AcT) stability is increased under adverse conditions such as high temperature (up to 75°C) as well as over long periods of time and room temperature storage conditions (23, 38, 84) (Figure 2a,b,c). Also, the conjugates thus formed can further be incorporated into polymer or paint-based coatings without undesired leaching of the enzyme (23, 71). The decontamination capabilities of such coatings were tested against various pathogens. Peracetic acid generated by carbon nanotube-immobilized S54V perhydrolase in a latex-based coating was found to be able to decontaminate >99% of 106 CFU/mL B. cereus spores within 1 h (Figure 2d), 4x107 PFU/mL influenza virus in 15 min, and 106 CFU/mL E. coli in only 5 min, upon addition of the substrates propylene glycol diacetate and hydrogen peroxide (23, 83). With a sustainable substrate source, such coatings can be used in the future as a passive decontamination measure to combat aerosolized anthrax. Additionally, Pangule et al. showed the antimicrobial capabilities of a lysostaphin-based coating. When such coatings were tested against 106 CFU/mL of methicillin-resistant Staphylococcus aureus (MRSA), >99% killing capability was achieved in only 2 h (36). Borkar et al. tested the bactericidal and sporicidal capabilities of two other enzymes incorporated into paint-based coatings, namely laccase and chloroperoxidase. Hypochlorous acid produced by chloroperoxidase in the presence of hydrogen peroxide and Cl- ions was found to be capable of killing >99% of 106 CFU/mL S. aureus and E. coli after 30 min. Immobilized laccase also showed bactericidal activity in the presence of several mediators with >99% killing achieved in 30 min for S. aureus and in 60 min for E. coli. The sporicidal 21 In Green Polymer Chemistry: Biocatalysis and Materials II; Cheng, H., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2013.


capabilities of laccase were also demonstrated with >99% killing of 104 CFU/mL B. cereus and B. anthracis spores in 2 h (24). All of these results show the enormous potential of enzyme-based systems for active surface decontamination in multiple situations including hospital and military scenarios (23, 24, 36, 83).

Figure 2. a) Thermal stability of free S54 perhydrolase (AcT; filled diamond), AcT crosslinked with aldehyde dextran (filled squares) and AcT crosslinked with aldehyde dextran and immobilized onto SWNTs (filled triangles) at 75°C. b) and c) Deactivation plots following second order deactivation model. d) Sporicidal activity of cross-linked AcT-nanotube based composites: control films (spores in buffer, filled diamond), films containing cross-linked AcT-nanotube (filled circles) and control spores in PGD and H2O2 reaction mixture (filled squares). (Reproduced with permission from reference (23). Copyright 2012 Elsevier).

Conclusions and Future Directions Recent advances in bioinformatics and molecular biology techniques have allowed production of enzymes with high activity, controlled specificity, and high catalytic power. Simultaneously, recent developments in immobilization of enzymes onto several nanoscale supports that have tailored properties controlled by the user, allowed the development of the next generation of enzyme-based applications as illustrated in this review. Growth in these areas will surely continue. For example, our groups continue to focus on enzyme-based decontamination strategies that will function without addition of external reagents, i.e., either the substrate or the enzyme mediator. Such enzyme-based decontamination strategies aim to be functional by simply relying on ambient conditions and will initiate in situ enzymatic generation of decontaminants; such systems are further defined as being self-sustainable. To achieve this goal, we 22 In Green Polymer Chemistry: Biocatalysis and Materials II; Cheng, H., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2013.


are currently investigating a working strategy that allows immobilization of chloroperoxidase enzyme onto titanium dioxide nanosupports. Titanium dioxide is a widely studied photocatalyst that produces hydrogen peroxide from water when excited under UV-light. Hydrogen peroxide generated at the photocatalyst nanointerface could serve as the substrate for enzymatic in situ hypochlorous acid generation; hypochlorous acid is a much stronger decontaminant than H2O2 (85, 86) and thus has a broader activity range against both bacterial and sporicidal contaminants (24). Such strategy may be used in the development of the next generation of self-sustainable decontamination systems upon incorporation into a coating. A major problem arising from the use of enzymes in a surface coating is enzyme deactivation over time (25). We envision the development of layeredbased technologies that would allow user-controlled coating performance of such enzyme-based decontamination strategies (Figure 3). Specifically, in a layered system, when the activity of the enzyme on the outer layer of the coating has decreased below an acceptable level, that layer can be peeled away to expose the lower layer, thereby extending the functional lifetime of the coating. Ultimately, the potential for biotechnological application will be whether such systems can be durable and operate over a wide variety of conditions while having increased operational stability, shelf-life and being environmentally and user friendly.

Figure 3. Enzymes are immobilized onto nanosupports and incorporated in composites in a layered technology. When the activity of the enzyme on the outer layer of the coating has decreased below an acceptable level, that layer can be peeled away to expose the lower layer, thereby extending the functional lifetime of the coating. (see color insert) 23 In Green Polymer Chemistry: Biocatalysis and Materials II; Cheng, H., et al.; ACS Symposium Series; American Chemical Society: Washington, DC, 2013.

Acknowledgments National Science Foundation (CBET-1033266) supported this work.

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